David Callihan M.S. Books

CLEP Core Exams W/ CD-ROM

By Patricia Van Arnum, Dominic Marullo, Rachelle Smith, Research And Education Association, Mel Friedman M.S., Scott Dittloff PhD, CLEP, Dr. Ken Springer PhD, Laurie Ann Callihan Ph.D., David Callihan M.S., Marullo, Dominic, Smith, Rachelle, Springer PhD, Dr. Ken, Friedman M.S., Mel, Callihan Ph.D., Laurie Ann, Callihan M.S., David, Dittloff PhD, Scott, Van Arnum, Patricia, CLEP

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Earn College Credit with REA's Test Prep for CLEP* Core Exams Everything you need to pass 6 CLEP* exams and get the college credit you deserve. CLEP* is the most popular credit-by-examination progr...

CLEP natural sciences

By Laurie Callihan

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Book Description: Earn College Credit with REA's Test Prep for CLEP* Natural Sciences. Everything you need to pass the exam and get the college credit you deserve. CLEP* is the most popular cred...

CLEP core exams

By Research And Education Association

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National Wildlife Refuge System

By David Callihan

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Natural Sciences REA

By Laurie Ann Callihan, David Callihan

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The best test preparation for the CLEP

By Laurie Callihan

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CLEP® Natural Sciences Book + Online

By Laurie Callihan, David Callihan, Laurie Ann Callihan, CLEP, Laurie Ann Callihan Ph.D., David Callihan M.S., Callihan Ph.D., Laurie Ann, Callihan M.S., David

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Earn College Credit with REA's Test Prep for CLEP® Natural Sciences There are many different ways to prepare for the CLEP® Natural Sciences exam. What's best for you depends on how much time you h...

How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.